El Salvador has agreed to house violent US criminals and receive deportees of any nationality, US Secretary of State Marco Rubio announced Monday, in an unprecedented – and legally problematic deal – that has alarmed critics and rights groups.

El Salvador President Nayib Bukele has agreed to imprison convicted criminals from any country that have been ordered deported out

El Salvador has extended an unprecedented offer to the United States: to take in deportees and violent criminals of any nationality. The announcement came from U.S. Secretary of State Marco Rubio on Monday following a meeting with Salvadoran President Nayib Bukele.

U.S. Secretary of State Marco Rubio said on Monday that El Salvador has offered to accept deportees of any nationality from the U.S., including incarcerated American citizens that would be held in the country’s maximum-security prison.

President Bukele, who labels himself as the "coolest dictator" and a "philosopher king," has built election success and immense popularity on an extreme security policy to combat gang violence in El Salvador, incarcerating large quantities of alleged gang members and securing a massive drop in homicides.

Nayib Bukele, El Salvador’s millennial dictator, has offered to house migrants and “dangerous criminals” deported by the United States in his country’s infamous mega jails, according to Marco Rubio.

U.S. Secretary of State Marco Rubio says the president of El Salvador, Nayib Bukele, has offered to house incarcerated people in his country's prison system. Bukele wrote that this would allow the United States to "outsource part of its prison system.

In a deal offered to the U.S. by El Salvador, American criminals could find themselves imprisoned thousands of miles from home in the small Central American country notorious for its harsh penal conditions.